Ventilator.



J. J. MAIER.

VENTILATOR.

APPLICATION FILED APR. 16, 1909.

937,254. Patented Oct. 19, 1909.

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JOHN J'. MAIER, 0F ATLANTA, GEORGIA.

VENTILATOR.

. Specification of Letters Patent.

Patented Oct. 19, 1909.

Application :filed April 16, 1909. Serial No. 490,204.

To all 'whom it may concern:

Be it known that I, JOHN J. MAIER, citizen of the United States, residing at Atlanta, in the county of Fulton and State of Georgia, have invented certain new and useful Improvements in Ventilators, of'which 'the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates particularly to cowls or hoods of sheet metal which are placed, usually above the roof of a building, upon the end of the Ventilating pipe of factories and the like where the volume of air to b e discharged is very large, and the pipe and hood correspondingly large. It is highly desirable that such a hood should be so constructed that rain is excluded, down-currents prevented, and the escape of air aided to an unusual degree, by winds, and further desirable that the hood, although large, should be light and at the same time strong and capable of strongly resisting distortion. The latter consideration is more important than it appears at a glance, fora large hood, often several feet in diameter, if made of thin sheet metal, for lightness, is very readily bent out of shape in handling and very diflicult to restore to form when so bent.

The objects of this invention are to secure the advantages while avoiding the evils suggested, and at the same time-to obtain certain gains in convenience and cost of manufacture.

In the accompanying drawings, Figure l is a side View, partly in axial section, of devices embodying my invention. Fig. 2 is a vertical section of a certain ring. Fig. 3 is a central horizontal section of a portion of the same ring. Fig. 4 is a side view of the joint in a certain shield member. Fig. 5 is a section on the line 5 5, Fig. 4. Fig. 6 is an elevation of a portion of a certain skirt.

In these views, A represents a pipe forming a part of, or adapted to lit closely, the Ventilating pipe which usually projects above the roof of the building to be venti lated. From the upper end of the pipe A depends an outwardly diverging conical skirt B, and above this pipe is a ring C which is centrally constricted in such manner that its smallest diameter is slightly greater than that of the pipe while its diameter at both upper and. lower margins is materially larger, the diameters gradually decreasing in passing toward the horizontal plane of the smaller part so that in crosssection the wall is a curve as shown, and so that the lower divergent portion is approximately parallel to the skirt B. At some distance above the plane of the upper margin of the ring is a 'cone D of relatively slight altitude, with its vertex in the common axls f of the pipe, skirt, and ring. Around the ring Cis fixed a much larger annular shield E having theV same axis, and the upper margin of which lies nearly inthe plane of the base of the cone, while its lower margin lies in a plane some distance below the top of the lpipe A. The ring, cone and shield are all gradually from zero at the upper and lower margins of the plates to a maximum at the innermost point of the vertical curve of each plate. The large ribs of adjacent plates iit closely over one another and are preferably soldered together throughout their meeting surfaces. By their form and doubled thickness they give the ring extraordinary stifness, and the parts being duplicates, individually of relatively small sizes, are very readily pressed into the desired form and united to form the ring. The outwardly projecting Vedges being uncorrugated yet supported by the tapered ribs strongly resist vertical bending, and the ring so formed resists force applied in any direction and tending either to distort the ring, as a whole, from plane or circular form, or'to bend any individual portion thereof, and the large and deep grooves and ribs also serve to aid materially in deilecting Winds upwardly, and thereby strengthen the current which tends to exhaust air from the upper end of the pipe A and still further to lessen the whirling movement of the air about the axis of the pipe due to the tendency of the air upon each side of the radial line of the winds direction to pass around the pipe horizontall The cone I) is made from a plane sheet disk by forming therein, at short circumferential intervals, radial ribs D which gradually increase in Width in passing outward, and thereby the disk is made conical and at the same time greatly stilfened and protected.

rlhe shield E is, in general form, a short cylinder provided with large circumferential corrugations or ribs E and it is formed from a strip of uniform Width bent to proper form and having its end portions cut to form longitudinal lingers E2 which, in joining the ends, pass alternately within and without the metal of the companion end and are riveted or soldered thereto, or both riveted and soldered, thereby securing a union which offers very great resistance to displacement of the parts in any direction whatever. In fact, without solder or rivets, the joint is rigid and the parts can move only longitudinally.

The lower margin of the skirt B is pressed into the form of an annular rib B2, its inclined body portion is passed outward to form a series of half cones B3 having the vertexes at the rib, its upper marginal portion is bent to vertical position between the cones, the surplus stock being folded over at B4, the part above the cones is bent downward to form a vertical flange, litting the interior of the pipe, the upper end of which is thus held between the two vertical portions of the skirt and reinforced terminally as Well as within and without. rIhe exterior vertical portion of the skirt is integrally united throughout nearly its entire width with the large end of the rib which is integral with and extends across the oblique portion, vanishing near the margin thereof. Thus the vertical and oblique portions of the skirt are rigidly held at a fixed angle with each other, the edge of the skirt is held against vertical bending by the ribs, which do not reach and corrugate it. The whole rigid skirt member holds the very large and thin end of the pipe in circular form, whereby it better sustains the shield, ring, and cone. It is also obvious that these large ribs in radial vertical planes strongly tend to deflect the air upwardly and to resist its passing around the pipe horizontally, in this co-acting with the ribs of the ring above.

What I claim is:

1. The combination with an open ventilating pipe, of a concentric, horizontal, centrally constricted ring fixed above the end of the pipe, projecting beyond its walls, and provided with large inwardly projecting vertical ribs at some distance apart; whereby the whirling tendency of air currents strik ing the ring laterally is lessened.

2. rllhe combination with an open ventilating pipe provided with a skirt diver-ging downwardly from its upper end and having upon its upper side radial ribs, of a concentric, horizontal, centrally constricted ring above the end of the pipe, projecting beyond its walls, and provided between its margins with inwardly projecting ribs in adial planes and at some distance from each other; whereby the tendency of horizontal air currents to pass around the axis of the pipe is resisted by the skirt below and the ring above.

3. In apparatus of the class described, the combination with an open Ventilating pipe, of a horizontal, concentric, centrally constricted ring above the end of the pipe and provided at intervals with heavy inwardly projecting radial ribs the projection of which gradually increases from zero at the margin of the ring to a maximum near its medial horizontal plane.

a. In apparatus of the class described, the combination with an open ventilating pipe and air deflecting devices above the end of the same, of an upwardly converging skirt having a doubled. cylindrical upper end por tion adapted to lit the interior and exterior of the pipe wall, and a series of adjacent ribs, in radial planes, pressed out from the body of the metal and having their outer elements extending approximately from the upper to the lower margin of the skirt.

5. The combination with an open vertical ventilator pipe and an air dellecting device above its end, of a conical sheet metal skirt having at its smaller upper end an integral vertical portion fitting, collar-like, the upper end of the pipe, said skirt being provided upon its upper side with radial stilfening and air-detlecting ribs integral with both the body of the skirt and said vertical portion and gradually increasing in projection, from said body, from zero at the skirts lower margin to approximately the 'width of said vertical portion at the point where it meets the latter.

In testimony whereof I affix my signature in presence of witnesses.

JOHN J. MAIER.

IVitnesses GRAHAM I). DozrnR, EUGENE Donn, CHAs. E. lVILKEs. 

